package string;

public class StringBuilderDemo {
    public static void main(String[] args) {

        String str = "好好学习java";
        //复制str的内容到builder中
        StringBuilder builder = new StringBuilder(str);
        builder.append("，为了找个好工作");//末尾追加
        System.out.println(builder);

        builder.replace(9,16,"就是为了改变世界");//替换(含头不含尾)
        System.out.println(builder);

        builder.delete(0,8);//删除下标为0到7的
        System.out.println(builder);

        builder.insert(0,"活着");//插入内容
        System.out.println(builder);



/*        //StringBuilder的创建方式
        StringBuilder builder1 = new StringBuilder();
        StringBuilder builder2 = new StringBuilder("abc");
        //String 和 StringBuilder互转:
        String str = "abc";
        StringBuilder builder3 = new StringBuilder(str);
        String str2 = builder3.toString();*/
    }
}
